Definition

/mæsk/

noun

A cover, or partial cover, for the face, used for disguise or protection.
“a dancer's mask; a fencer's mask; a ball player's mask”
That which disguises; a pretext or subterfuge.
A festive entertainment of dancing or other diversions, where all wear masks; a masquerade
A person wearing a mask.
A dramatic performance, formerly in vogue, in which the actors wore masks and represented mythical or allegorical characters.

verb

To cover (the face or something else), in order to conceal the identity or protect against injury; to cover with a mask or visor.
To disguise; to cover; to hide.
To conceal; also, to intervene in the line of.
To cover or keep in check.
“to mask a body of troops or a fortess by a superior force, while some hostile evolution is being carried out”
To take part as a masker in a masquerade